The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown.

The more success the quantum theory has, the sillier it looks

I have made no secret, either privately or publicly, of any sense of outrage over officially enforced military and war service. I regard it as a duty of conscience to fight against such barbarous enslavement of the individual with every means available.

The trite objects of human efforts-possessions, superficial success, luxury-have always seemed contemptible to me.

You cannot prevent and prepare for war at the same time.

You can't resolve a dilemma with all the very same mind that made it

... it is a welcome symptom in an age which is commonly denounced as materialistic, that it makes heroes of men whose goals lie wholly in the intellectual and moral sphere.